Japanese discount chain Don Don Donki is set to double its number of Hong Kong outlets to six by early 2021, bucking the trend of a retail industry in decline during the coronavirus pandemic.Pan Pacific Retail Management in Hong Kong on Tuesday announced its plan to launch three new branches of the superstore in the city, the first of which will open at 100 Queen’s Road Central on October 15.The O’South Coast store at Tseung Kwan O would make its debut in November, followed by the Island Resort…